Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
SigNoz - Open source alternative to Datadog
Mist.io - A secure cloud management platform for automation, orchestration, cost and usage monitoring of public and private clouds. Provides multi-cloud RBAC. Enables self service provisioning. Cost analysis and cloud spending optimization
Librato - Your monitoring infrastructure in the cloud. Store, visualize and alert on all your metrics at all levels of the stack. Get your 30d free trial.
NewRelic - New Relic is a Software Analytics company that makes sense of billions of metrics across millions of apps. We help the people who build modern software understand the stories their data is trying to tell them.
Zipkin - Zipkin is a distributed tracing system.